.foo
  z-index: 10
  display: block
  .bar
    .baz
      z-index: 20

.test
  @media (max-width: 100px)
    z-index: 10

=test ($level)
  z-index: $level
  display: block

@function myFunc($level)
  @return $level * 2

.func-res
  z-index: myFunc(10)
  display: block

interp
  z-index: #{20}
  display: block
